"You got it, Chief!" Milo follows him in, having stayed behind a moment to watch the door for any unwelcome tagalongs. Like an enemy spy or whatever. Or Bobbin.

But all seems well, so he begins testing floorboards with his feet to find any particularly loose or creaky ones.

Though it's more likely that Eddie will be the one to find this particular thing, hidden in the corner nearest him under a floorboard that is already partially broken. The glint of a metal latch catches in his lantern light...